One-pot pseudo-five-component cynthesis of cihydropyrano [2,3- g]chromene derivatives

چکیده مقاله

In recent years a novel and efficient method was reported for the synthesis of Dihydropyrano[2,3-g] chromene derivatives via addition and subsequently cyclization of 2,5- dihydroxy-1,4-benzoquinone to the condensation product of an aldehyde with malo nonitrile in the presence of a catalytic amount of Et3N in CH3CN.3 We now report a new efficent and simple method for the synthesis of Dihydropyrano[2,3,g]chromene in the presence of sodium phthalimide and ionic liquids(ILs). The use of ILs as a green solvents has gained considerable importance due to their negligible vapour pressure, solvating ability and easy recyclability